Sleep is important for hippocampus-dependent memory consolidation. In particular, sleep facilitates memory for detailed memory representations that are thought to rely on hippocampal pattern separation processes. By contrast, sleep also facilitates the generalisation of memories (i.e., gist memory). A parallel line of research has shown that motivational salience (e.g., reward or curiosity) enhances hippocampus-dependent memory via interactions within the dopaminergic-hippocampal circuit. Furthermore, curiosity states, accompanied by dopaminergic-hippocampus interactions, enhance subsequent recognition memory for incidental information (i.e., face images) encountered during high- compared to low-curiosity states. However, it is unknown whether and how sleep affects curiosity-related memory enhancements for incidental information. Here, we used a trivia paradigm that elicits states of curiosity during encoding of incidental objects. After a 9-hour delay period of sleep or wakefulness, participants took part in a recognition memory test that included the previously encoded (old) objects, highly similar lures, and novel objects. The memory test allowed investigation of whether states of high-curiosity lead to enhancements of detailed memory representations (measured via 'similar' responses to similar lures) or gist-based memory (measured via false alarms to similar lures). Preliminary findings suggest that sleep compared to wakefulness changed the type of memory representation. Consistent with earlier findings, the wake group showed curiosity-enhanced recognition for incidental information (i.e., objects). However, while the sleep group showed overall higher memory for incidental objects, curiosity states primarily enhanced gist-based memory. The findings suggest that sleep influences the type of memory representation of salient information towards gist-based rather than detailed memory representations.